1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.ex.variablespeed;
18
19import android.media.MediaPlayer;
20
21import java.util.concurrent.BlockingQueue;
22import java.util.concurrent.LinkedBlockingQueue;
23import java.util.concurrent.TimeUnit;
24import java.util.concurrent.TimeoutException;
25
26import javax.annotation.concurrent.ThreadSafe;
27
28// TODO: There is sufficent similarity between this and the awaitable error listener that I should
29// extract a common base class.
30/** Implementation of {@link MediaPlayer.OnErrorListener} that we can wait for in tests. */
31@ThreadSafe
32public class AwaitableCompletionListener implements MediaPlayer.OnCompletionListener {
33    private final BlockingQueue<Object> mQueue = new LinkedBlockingQueue<Object>();
34
35    @Override
36    public void onCompletion(MediaPlayer mp) {
37        try {
38            mQueue.put(new Object());
39        } catch (InterruptedException e) {
40            // This should not happen in practice, the queue is unbounded so this method will not
41            // block.
42            // If this thread is using interrupt to shut down, preserve interrupt status and return.
43            Thread.currentThread().interrupt();
44        }
45    }
46
47    public void awaitOneCallback(long timeout, TimeUnit unit) throws InterruptedException,
48            TimeoutException {
49        if (mQueue.poll(timeout, unit) == null) {
50            throw new TimeoutException();
51        }
52    }
53
54    public void assertNoMoreCallbacks() {
55        if (mQueue.peek() != null) {
56            throw new IllegalStateException("there was an unexpected callback on the queue");
57        }
58    }
59}
60